EP3096015B1 - Pompe à engrenages - Google Patents

Pompe à engrenages Download PDF

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Publication number
EP3096015B1
EP3096015B1 EP16169754.5A EP16169754A EP3096015B1 EP 3096015 B1 EP3096015 B1 EP 3096015B1 EP 16169754 A EP16169754 A EP 16169754A EP 3096015 B1 EP3096015 B1 EP 3096015B1
Authority
EP
European Patent Office
Prior art keywords
conduit
rib
pump
pump according
housing compartment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16169754.5A
Other languages
German (de)
English (en)
Other versions
EP3096015A1 (fr
Inventor
Marco Guidetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Casappa SpA
Original Assignee
Casappa SpA
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Publication date
Application filed by Casappa SpA filed Critical Casappa SpA
Publication of EP3096015A1 publication Critical patent/EP3096015A1/fr
Application granted granted Critical
Publication of EP3096015B1 publication Critical patent/EP3096015B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons

Definitions

  • the present invention relates to a gear pump and a method for constructing it.
  • Gear pump means a pump in which the change in volume induced by the meshing of two bodies is exploited to transfer energy to a fluid passing through the pump.
  • gear pumps comprising:
  • gear pumps One drawback of gear pumps is tied to the need to reinforce the delivery conduit, since greater pressures occur in that zone. In this way both stress and deformations are reduced to the advantage of correct functioning, but the overall dimensions of the pump are increased because of the larger thicknesses required.
  • a known gear pump is disclosed by WO2009/126223 .
  • the technical task at the basis of the present invention is to provide a pump which enables the overall dimensions to be reduced without penalising the correct functioning and reliability thereof.
  • the reference number 1 indicates a gear pump.
  • Said pump 1 comprises a compartment 20 housing said gears which transfer energy to a fluid crossing the pump 1.
  • the gears comprise two cogwheels that reciprocally mesh and are positioned in the housing compartment 20.
  • One of the gears could possibly have external teeth and the other internal teeth.
  • the two gears could be rolling bodies that interact with each other, but do not have an involute profile (for example, a lobe pump).
  • the pump 1 also comprises a first conduit 21 which develops from the housing compartment 20.
  • said first conduit 21 is a delivery conduit.
  • the first conduit 21 is thus used for discharging the fluid under pressure from the compartment 20.
  • the pump 1 comprises a first stiffening rib 31 that crosses the first conduit 21.
  • the first stiffening rib 31 divides the flow of fluid into at least two parts. The two parts reconverge downstream of said first rib 31.
  • the first rib 31 thus serves to stiffen the delivery conduit, minimising the tensions of the material and consequently the deformations without oversizing in thickness the walls of the first conduit 21. It is thus possible to minimise the outer dimensions of the pump 1.
  • the first stiffening rib 31 comprises a fin 310 having an aerodynamic profile. This enables pressure drops to be minimised. An even more important advantage may be had in the case of a reversible pump, as better explained below.
  • the pump 1 advantageously comprises a second conduit 22 which terminates in said housing compartment 20.
  • the second conduit 22 is an aspirating conduit.
  • the pump 1 also comprises a second stiffening rib 32 crossing said second conduit 22.
  • the pump 1 is reversible. It can thus also function in a second operating mode in which the first conduit 21 becomes an aspirating conduit and the second conduit 22 becomes a delivery conduit.
  • the presence of the rib 32 also in the second conduit 22 is thus important.
  • the second conduit 22 can also become a delivery conduit and therefore be subject to considerable stresses due to the fluid under pressure.
  • the second stiffening rib 32 comprises a fin 320 having an aerodynamic profile.
  • this feature serves to minimise the pressure drops on the aspirating side in order to reduce the risk of cavitation (in the first operating mode the second rib 32 operates under aspiration and the aerodynamic profile helps for that purpose).
  • first conduit 21 and the second conduit 22 comprise two ports 23, 24 which lie side by side on a same wall of the pump 1, turned outward. Internally of the pump the first and the second conduit 21, 22 extend side by side.
  • the two ports 23, 24 of the first and the second conduit 21, 22 could be located on two distinct walls of the pump 1; in particular, they could be lateral.
  • first conduit 21 and the first rib 31 are in a single monolithic body.
  • the second conduit 22, the second rib 32 and at least a part of the housing compartment 20 are in a single monolithic body.
  • the single monolithic body is advantageously made of cast iron.
  • the single monolithic body also defines an external casing that delimits at least in part the pump 1 from the outside.
  • the first conduit 21, the second conduit 22, the first and second rib 31, 32 and at least a part of the housing compartment 20 are symmetrical with respect to a median plane 4 interposed between the first and the second conduit 21, 22.
  • the first rib 31 comprises:
  • the first and the second surface 311, 312 comprise a portion 315 in which they are reciprocally divergent and a portion 316 in which they are reciprocally convergent.
  • One of the two parts of the flow divided by said first rib 31 skims over the first surface 311 and the other over the second surface 312.
  • the first conduit 21 comprises a first delimiting wall 25 that faces the first surface 311 and defines a concavity turned toward the first surface 311.
  • the first conduit 21 comprises a second delimiting wall 26 of that faces the second surface 312 and defines a concavity turned toward the second surface 312.
  • the first rib 31 connects to remaining parts of the monolithic body at a first and a second end 317, 318 thereof, which are reciprocally opposite.
  • the first end 317 is closer to an outer surface of the pump than the second end 318.
  • At least a transversal section that is intermediate with respect to the first and the second end 317, 318 has a smaller surface than a surface of the transversal section measured at the first and second end 317, 318.
  • the intermediate section has a chord and/or average thickness that is/are smaller than those of the transversal section measured at the first and the second end 317, 318.
  • the first rib 31 has a larger transversal section at the first end 317 than at the second end 318.
  • the invention thus conceived enables multiple advantages to be obtained. First of all, it permits a reduction in the overall dimensions of the pump 1.
  • the first rib 31 (positioned in the first conduit 21) enables the delivery side of the pump 1 to be stiffened without reinforcing the thickness of the conduits.
  • the aerodynamic shape of the fin makes it possible to avoid significant pressure drops on the aspirating side (and the consequent risk of cavitation) in the event that the pump functions in a reversible mode and the first conduit 21 thus acts as an aspirating conduit.
  • the invention thus conceived is susceptible of numerous modifications and variants, all falling within the scope of the inventive concept characterising it. Moreover, all of the details may be replaced with technically equivalent elements. In practice, all of the materials used, as well as the dimensions, may be of any type, according to need.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Claims (9)

  1. Pompe à engrenages comprenant :
    - un compartiment de logement (20) desdits engrenages qui transfèrent de l'énergie vers un fluide traversant la pompe (1) ;
    - une première conduite (21) se développant à partir du compartiment de logement (20), dans un premier mode de fonctionnement ladite première conduite (21) étant une conduite de refoulement ;
    caractérisée en ce qu'elle comprend
    - une première nervure de renforcement (31) traversant ladite première conduite (21) et étant destinée à diviser en au moins deux parties le flux de fluide transitant en correspondance de ladite première nervure (31) ;
    ladite première nervure (31) comprend :
    - une première et une seconde surface (311, 312) étant mutuellement opposées l'une à l'autre ;
    - un bord d'attaque (313) et un bord de sortie (314) de la première nervure (31) étant arrondis et qui relient réciproquement la première et la seconde surface (311, 312) .
  2. Pompe selon la revendication 1, caractérisée en ce que ladite première nervure de renforcement (31) comprend une ailette (310) ayant un profil aérodynamique.
  3. Pompe selon la revendication 1 ou 2, caractérisée en ce qu'elle comprend :
    - une seconde conduite (22) se terminant dans ledit compartiment de logement (20), dans le premier mode de fonctionnement ladite seconde conduite (22) étant une conduite d'aspiration ;
    - une seconde nervure de renforcement (32) traversant ladite seconde conduite (22) ;
    la pompe (1) étant réversible et pouvant fonctionner aussi dans un second mode de fonctionnement dans lequel ladite première conduite (21) devient une conduite d'aspiration et ladite seconde conduite (22) devient une conduite de refoulement.
  4. Pompe selon la revendication 3, caractérisée en ce que ladite seconde nervure de renforcement (32) comprend une ailette (320) ayant un profil aérodynamique.
  5. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que ladite première conduite (21) et ladite première nervure (31) se présentent sous la forme d'un corps monolithique unique.
  6. Pompe selon la revendication 3 ou 4, caractérisée en ce que ladite première conduite (21), ladite seconde conduite (22), lesdites première et seconde nervures (31, 32) et au moins une partie du compartiment de logement (20) se présentent sous la forme d'un corps monolithique unique.
  7. Pompe selon la revendication 3 ou 4 ou 6, caractérisée en ce que ladite première conduite (21), ladite seconde conduite (22), lesdites première et seconde nervures (31, 32) et au moins une partie du compartiment de logement (20) sont symétriques par rapport à un plan médian (4) interposé entre la première et la seconde conduite (21, 22).
  8. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que par rapport à un parcours allant du compartiment de logement (20) vers un extérieur de la pompe (1) le long de la première conduite (21), la première nervure
    (31) comprend :
    - une partie (315) dans laquelle la première et la seconde surface (311, 312) sont divergentes réciproquement ; et
    - une partie (316) dans laquelle la première et la seconde surface (311, 312) sont convergentes réciproquement.
  9. Pompe selon la revendication 5 ou 6, caractérisée en ce que ladite première nervure (31) relie les parties restantes du corps monolithique à ses première et seconde extrémités (317, 318), réciproquement opposées ;
    au moins une section transversale, étant intermédiaire par rapport aux première et seconde extrémités (317, 318), comportant une surface plus petite qu'une surface de la section transversale mesurée entre la première et la seconde extrémité.
EP16169754.5A 2015-05-20 2016-05-16 Pompe à engrenages Active EP3096015B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB20150848 2015-05-20

Publications (2)

Publication Number Publication Date
EP3096015A1 EP3096015A1 (fr) 2016-11-23
EP3096015B1 true EP3096015B1 (fr) 2019-12-04

Family

ID=53901006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16169754.5A Active EP3096015B1 (fr) 2015-05-20 2016-05-16 Pompe à engrenages

Country Status (1)

Country Link
EP (1) EP3096015B1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6976833B2 (en) * 2003-11-17 2005-12-20 Carrier Corporation Compressor discharge chamber with baffle plate
US20100135839A1 (en) * 2006-12-26 2010-06-03 Fraser Bruce A Screw compressor with integral bearing cover and discharge plenum divider
MX2010010967A (es) * 2008-04-09 2010-11-05 Nestec Sa Bombas de engranaje y metodos para usar las bombas de engranaje.
GB2507029B (en) * 2012-07-11 2019-04-17 Quantex Patents Ltd Pump fittings and methods for their manufacture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3096015A1 (fr) 2016-11-23

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